Submission #1004814

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004814		thinknoexit	Coreputer (IOI23_coreputer)	C++17	100 / 100	1 ms	344 KiB

coreputer

#include "coreputer.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int n;
vector<int> malfunctioning_cores(int N) {
	n = N;
	int l = 0, r = n - 1;
	int parity = 1;
	while (l < r) {
		int mid = (l + r) / 2;
		vector<int> t;
		for (int i = 0;i <= mid;i++) t.push_back(i);
		int res = run_diagnostic(t);
		if (res >= 0) {
			r = mid;
			parity = min(parity, res);
		}
		else l = mid + 1;
	}
	vector<int> ans(n, 0);
	ans[l] = 1;
	int now = 1;
	if (l == n - 1) {
		return ans;
	}
	// trycheck
	for (int i = 0;i < l;i++) {
		vector<int> t;
		for (int j = 0;j <= l;j++) if (j != i) t.push_back(j);
		if (run_diagnostic(t) < 0) ans[i] = 1, now ^= 1;
	}
	for (int i = l + 1;i < n - 1;i++) {
		vector<int> t;
		for (int j = 0;j < l;j++) t.push_back(j);
		t.push_back(i);
		if (run_diagnostic(t) >= 0) ans[i] = 1, now ^= 1;
	}
	ans[n - 1] = now ^ parity;
	return ans;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40